Cisco CCNA / CCNP Exam Tutorial: Testing ISDN Links With out Pings
To gain your Cisco CCNA and CCNP certifications, you’ve obtained to grasp ISDN – and In spite of what lots of people say, there’s continue to plenty of ISDN to choose from that should be supported. And In relation to troubleshooting ISDN, there’s a great deal to take a look at. Is the right ISDN switchtype configured? Are the dialer map statements right? How about the dialer-group and dialer-list commands? And that’s just the beginning.
I constantly say that each one troubleshooting starts at Layer 1, the Physical layer with the OSI design. The usual approach to troubleshooting ISDN is sending pings across the website link, though the connection could be examined with out working with pings as well as before assigning IP addresses to the BRI interfaces!
It’s a smart idea to place these take a look at phone calls right before configuring the interfaces – that way, you are aware of you’ve obtained a sound relationship prior to starting the configuration (and there’s loads of config to associate https://en.wikipedia.org/wiki/?search=토토사이트 사설사이트 with ISDN!)
To place a test get in touch with with out working with pings, use the isdn call interface command.
R1#isdn phone interface bri0 8358662
R1#
03:54:43: BR0 DDR: Aiming to dial 8358662
03:fifty four:43: %Backlink-three-UPDOWN: Interface BRI0:one, transformed condition to up
03:54:44: BR0:1 DDR: dialer protocol up
03:fifty four:forty five: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, improved point out to up
03:fifty four:49: %ISDN-six-CONNECT: Interface BRI0:one is now linked to 8358662 R2
To tear the test contact down effectively, use isdn disconnect interface. IOS Support shows the choices using this type of command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data simply call(s) on all b channels
b1 Disconnect the information call on b1 channel
b2 Disconnect the data connect with on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting connect with
03:58:36: BR0:two DDR: disconnecting contact
03:fifty eight:36: %ISDN-6-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, contact lasted 20 seconds
03:58:36: %Backlink-3-UPDOWN: Interface BRI0:one, changed point out to down
03:58:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, adjusted condition to down
I say “effectively” as the one thing you don’t need to do to end an ISDN contact, test or usually, is just shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even fewer. Always Permit the d-channel do its get the job done and tear the decision down within an orderly style – don’t just Minimize it off by shutting the interface down.